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Business combinations and disposals - Acentia (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2015 | Apr. 01, 2015 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Preliminary Purchase Price Accounting |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  | $ 46,651 | $ 289,212 | $ 2,670
Goodwill |  |  |  | 21,453 |  |
Acentia |  |  |  |  |  |
Business combinations |  |  |  |  |  |
Share capital acquired (as a percent) |  | 100.00% |  |  |  |
Preliminary Purchase Price Accounting |  |  |  |  |  |
Cash consideration, net of cash acquired |  | $ 293,500 | $ 293,504 |  |  |
Accounts receivable and unbilled receivables |  |  | 35,333 | 35,333 |  |
Other current assets |  |  | 3,091 | 3,091 |  |
Property and equipment |  |  | 2,140 | 2,140 |  |
Intangible assets |  |  | 69,900 | 69,900 |  |
Total identifiable assets acquired |  |  | 110,464 | 110,464 |  |
Accounts payable and other liabilities |  |  | 31,350 | 31,350 |  |
Deferred revenue |  |  | 251 | 251 |  |
Capital lease obligations |  |  | 567 | 567 |  |
Deferred tax liabilities |  |  | 6,741 | 6,741 |  |
Total liabilities assumed |  |  | 38,909 | 38,909 |  |
Net identifiable assets acquired |  |  | 71,555 | 71,555 |  |
Goodwill |  |  | 221,949 |  | 214,325 |
Net assets acquired |  |  | 293,504 | 293,504 |  |
Goodwill anticipated to be deductible for tax purpose |  | $ 175,000 |  |  |  |
Acentia | Customer relationships |  |  |  |  |  |
Preliminary Purchase Price Accounting |  |  |  |  |  |
Amortization period of intangible assets |  | 14 years |  |  |  |
Acentia | Previously reported |  |  |  |  |  |
Preliminary Purchase Price Accounting |  |  |  |  |  |
Cash consideration, net of cash acquired | $ 293,504 |  |  |  |  |
Accounts receivable and unbilled receivables | 35,333 |  |  |  | 35,333 |
Other current assets | 5,050 |  |  |  | 5,050 |
Property and equipment | 2,140 |  |  |  | 2,140 |
Intangible assets | 69,900 |  |  |  | 69,900 |
Total identifiable assets acquired | 112,423 |  |  |  | 112,423 |
Accounts payable and other liabilities | 32,426 |  |  |  | 32,426 |
Deferred revenue | 251 |  |  |  | 251 |
Capital lease obligations | 567 |  |  |  | 567 |
Deferred tax liabilities | 0 |  |  |  | 0 |
Total liabilities assumed | 33,244 |  |  |  | 33,244 |
Net identifiable assets acquired | 79,179 |  |  |  | 79,179 |
Goodwill | 214,325 |  |  |  |  |
Net assets acquired | $ 293,504 |  |  |  | $ 293,504 |
Acentia | Adjustments |  |  |  |  |  |
Preliminary Purchase Price Accounting |  |  |  |  |  |
Cash consideration, net of cash acquired |  |  |  | 0 |  |
Other current assets |  |  | (1,959) | (1,959) |  |
Total identifiable assets acquired |  |  | (1,959) | (1,959) |  |
Accounts payable and other liabilities |  |  | (1,076) | (1,076) |  |
Deferred tax liabilities |  |  | 6,741 | 6,741 |  |
Total liabilities assumed |  |  | 5,665 | 5,665 |  |
Net identifiable assets acquired |  |  | (7,624) | (7,624) |  |
Goodwill |  |  |  | 7,624 |  |
Net assets acquired |  |  | $ 0 | $ 0 |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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